Red Hat Enterprise Linux 5 Administration Unleashed

400CHAPTER 19Explaining Other Common Network ServicesThe printer server must be configured to send and receive connections on incoming UDPport 631. All clients must be allowed to send and accept connections on port 631.SummaryThis chapter detailed several important network services. The xinetd super server can beused to monitor traffic for network services and start the appropriate service if theconnection passes the host-based access control rules. To share files over a privatenetwork or the Internet, the FTP service can be used. Use it with caution because files aretransferred unencrypted. For time synchronization across servers, consider the NTPservice. Finally, CUPS is available for network access to a central printer.